Pneumatic paintbrush



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July 7, 1925.

J. A. PAASCHE PNEUMATIC PAINTBRUSH P'lod April 6, 1917 2 Sheets-Shoot 2l n w In'dz/r Jens d. fmsciie Patented July 7,A 1925.

UNITE-D Vs'rar JENS `A.`1A.AYSCHE, OF CHICAGO, ILLINOIS.

PNEUMATIC PAINTBRUSI-I.

Application mea April e,

To all whom. it may concer/n:

Be it known that I JENs A. PAAsoHE, a citizen of the United States,residing at Chicago, in the county of Cook andState of Illinois, haveinvented certain new and useful Improvements in Pneumatic Paintbrushes,of which the following is a speciication. y

This invention relates to a pneumatic paintbrush of the generalcharacter disclosed in my prior Patent No. 1,104,217, issued July 21,1914.

One of the objectsy of the invention is to provide improved airdischarge means whereby, in addition to thev main central stream of air,two opposite `circumferential or side streams of air may be provided, ifdesired, said side streams being discharged at oblique angles to themain stream and 2,0 converging toward the main stream so as to vflattenthe latter into a thin wide spray.

Another object is to improve the paintl discharge means by providing apaint tube or needle-valve ofimproved construction.

Further objects and advantages of the invention will be set forth in thefollowing detail description. y In the accompanying drawings, Figure 1is a longitudinal central section through a pneumatic paintbrushembodying the features of my invention, Fig. 2 is a horizontal sectionalview through the body illustrating the means for securing the primaryhandle to the body. Fig. 3' is a transverse section further illustratingsaid handle-securing means. Fig. 4 is a detail perspective view showingthe improved paint-conveying needle or tube- Fig-..5 is an' enlargedhorizontal sectional view through the air-discharging means. Fig. 6 is atransverse section taken in the plane of line 6 6 of Fig. 5 and lookingin the direction of the arrows. Fig. 7 is a view similar to Fig. 6 butshowing the adjustable annulus turned 90 degrees to position thecircumferential air outlets at the top and bettoln of the head insteadof at horizontally opposite sides. as in Fig. 6. Fig. 8 is a front endelevation of the brush showing a slightlyl modified form ofcircumferential-air outlets. Figs. 0 and 10 (Sheet 1) are' sectionaldetail views vof the adjustable annulus embodied inthe forms of airdischarge heads 'ward end of which flared at 25.

1917. Serial No. 160,161.

shown in Figs. 1 to 7 and. in Fig. 8, reA spectively. Fig. 11 is ahorizontal or plan section through the form of head shown in Figs. 1 to7 illustrating .the flattening action of the side air streams on themain or central stream. Fig. 12 is a -sectional .elevationl through theform of head shown in Fig. 8 and illustrating in side view the action ofthe circumferential air streams upon the central stream.

I will herein describe in detail the preferred embodiment of myinvention which is illustrated in the drawings, but it should beunderstood that I do not limit myselfl to the exact form disclosed, butaim to cover in the appended claims all modifications and equivalentsfalling within the scope of the invention. j

The form. of brush disclosed is adapted to be held in the hand likeapistol and comprises a tubular body or barrel 15 and a depending handle16 approximately, perpendicular thereto. The preferred means forsecuring the handle to the body comprises-a headed bolt 17 passingthrough the upper portion of the handle and a nut 18 threaded on thelower 'end of said bolt and occupying ari-open space 19 in the handle.The body is provided with a slot 20 through which the trigger levers, tobe later described, extend and a narrower slot 21 runs rearwardly fromthe slot 20. In attaching the handle to the body, the head ofthe boltv17 is passed through the slot 20 and then slipped rearwardly into thenarrower slot 2l and the handle 16 and nut. 18 are then applied. so thatwhenA the nut is tightened up the handle will be firmly clamped to thebody. The slot 21 is of less width thanv the diameter of the hea-d andthe bolt, and the bolt is preferably providedr with opposite kflattenedfaces diree-tly beneath the head which fit snugly in the slot 2,1 so asto prevent rotation of the bolt in the slot.

0n the forward end of the body l5 is mounted an yair discharge head 22which preferably has a shank 23 threaded into the tapered forward end ofthe body: Said air hea-d has a. central passage 24, the for- An airsupplypipe 26 within the body has its forward end fitting snugly in therear of the passage 24, the rear end of'said pipe engaging in aplural-part head 27 which closes the rear end of the body. This head maybe of similar construction to that shown in my prior patent abovereferred to and need be herein only briefly described. The pipe 26communicates with a passage 28 which runs through the head structure andis supplied with air from a flexible hose, a fragment o-f which isindicated at 29. A valve 30 is normally held by a spring 31 in positionto close the air passage to the head, said valve being arranged tobeopened rearwardly by a plunger 32 slidable in the head. This plunger isconnected by a link 33 to a trigger lever 34 pivoted at its upper endat. 35 in the body and passing downwardly through the slot 20. A secondtrigger lever 36 is pivoted at 37 to thehandle 16 rearwardly of thefirst trigger 34, and the ends of the two triggers are normally spacedapart to allow the air valve to be opened-before the rear trigger 36 isengaged. A rod 38 p-ivoted tothe upper end of the rear trigger 36extends forwardly thro-ugh the body and is associated at its forward endwith the paint disch-arge means tobe present-ly described. lVhen thetrigger 34 is drawn rearwardly, the link 33 and rod 38 are movedlongitudinally in opposite directions so as to open the air valve 30 andthe color discharge means. A stop-screw 39 threaded in the handle isarranged to be set in any desired position to limit the rearwardmovement of the triggers. A lock-nut 40 on said stop-screw is adapted tofix theset-screw in any desired position.

The paint discharge means comprises a sleeve 41which passes through anopening in a lug 42 depending from the body 15, the sleeve being rigidlyfixed in the opening by a set-screw 43. 44 indicates a portion of aconductor which communicates with a supply of paint and is attached tothe sleeve 41 by a collar 45. On the forward end of the sleeve 41 isthreaded a sleeve 46. A paintconveying needle-valve or tube 47 has itsrea-r end fixed in the forward end of the sleeve 41 and on this tube isslidably mounted a nozzle 48 having an annular shoulder 49 on its rearend which is engaged by a coiled spring 50 surrounding the nozzle so asto normally press the nozzle rearwardly. The fo-rward end of the rod 38is Iarranged to engage a. shoulder 51 on the nozzle to more the latterforwardly against the action of the spring 50.

The forward end of the nozzle 48 is tapered and the needle or tube 47 isrovided at its forward end with a taperedpportio-n or valve member 52(Fig. 4) which fits snugly in the forward end of the nozzle to l closethe latter. This valve member is carried at the forward end of aconnecting portion 53 which is in the form of a letter U or V, the baseof which carries the valve member 52 and the arms of which are fixed 'tothe sides of the tube '47. In the present the forward portion of thenozzle when closed.

The air head 22 is provided with a hole in its'lo-Wer side through whichthe forward portion of the paint discharge structure projects so thatthe tip of the nozzle 48 is positioned well within the air streamissuing from the central passage 24 in the head.

In the operation of the structure as thus far described rearwardpressure of the trigger 34 will v`open the air valve 30 and continuedmovement will push the trigger 36 back and move the paint nozzleforwardly, whereupon the stream of air issuing from the central passage24 in the head will draw particles of paint out from the nozzle 48v andcarry such particles against the article to be painted. The stream ofmixed air and paint from the passage 24 and nozzle 48 will expandsomewhat, but normally would rctain its rounded or conical form. It issometimes desirable, however, to have the stream of mixture take theform of a widened and flattened spray, so that a greater space on thearticle being painted can be covered with one sweep of the brush. Thisis particularly advantageous in painting large articles or surfaces,such as furniture, walls and various other structures. I provide meansto accomplish the result mentioned by causing two opposedcircumferential air streams to issue from the head 22 at oblique anglesto the central stream and converging toward the latter, whereby thecentral stream of mixed air and paint will be fiattened in one directionand widened in a perpendicular direction that the resultant stream iSbroad and thin. I have herein illustrated two forms of structure foreffecting this end, one form being illustrated in Figs. 1 to 7, 0 and11, and the other form iu Figs. 8, l0 and 12. The two forms areidentical, except as to the location and shape of the circumferentialair outlets. .v

Referring to Fig. 1, it will be noted that the head is provided with anannular air passage 55 which is formed by complementary grooves in theexternal periphery of the head and in the internal periphery of anannulus 56 which surrounds the head. The mentioned external and internalperipheries of the head and annulus are tapered forwardly so as toprovide a tight fit between the two. tact with the head by means of acollar 57 engaging a shoulder on the annulus and being threaded ontoavradial flange 58 011 the head 22. By turning up the collar 57 tightlythe annulus may be'clamped in .air-tight relation to the head.

The head is provided witha passage 59 leading from the central passage2l to the annular passage 55. In the inner periphery of the-annulus 56at opposite sides thereof are formed two grooves 6() which merge attheir inner ends into the annularl groove forming part of the passage.55, said -side grooves becoming wider and shallower toward their forwardends.

controlled or cut off' entirely by means of a suitable valve melnber 6lseated in the head and arranged to close the supply passage 59.

. VVhen this valve is open and the brush is belng used, a part of theair will escape.

will be flattened, as indicated by the arrows in Fig. 11. so that itlies in a vertical plane.v

If it be desired toflatten the streamv in a horizontal direction, thecollar 57 is loosened sufficiently so thaty the annulus 56 may be turnedto position the outlet. grooves 60 above and below the central outlet,as shown in Fig. 7. The annulus 5G is preferably corrugated or lrnurledon its external periphery to facilitate gripping the same by the fingersin .turning it.

In the modified construction shown in.

Figs. 8, 10 and 12, the outlet grooves 62 in the annulus have one sidestraight and the other side sharply inclined, the grooves being sopositioned that the air streams issuing therefrom will flow inoppositely inclined directions, but vwill not be directly .opposed toeach otherso that the two side streams will exert a wiping action onopposite sides of the central stream of mixture and will not interferewithV eachother to a material extent. Referring to Fig. 12, a indicates.the 'outline or sha-pe of the central 7 stream as it would normally be,while b and I 'ential air outlets, .and paint,l discharge c designatethe two circumferential air streams,.whi ch as shown cross each otheralong opposite sides of the central stream and extend the latter inopposite directions. The resultant flattened stream is indicated at d.With this arrangement the increase in width of the resultant streamv isgreater p than with the modification first described, in

The annulus is held in close con-4 y yThe flow of air to these-circun'lferential air outlets may be which the two circumferentialstreams are, directly opposed to eachother, or, in other words, meet andmerge -at directly opposite sides of the central air stream.- v

l In the relation of parts shown in Fig. 8,

the annulus 56 is set to position lthe outlet grooves 62 adjacent to theupper and lower sides ofthe head, but laterally offset in oppositedirections from a vertical plane passing through the head. The positionof the grooves 62 may be adj-usted from that. show-u in Fig.- 8 byloosening the collar 57 and turning the annulus 56 as before describedso as to change the angle which the flattened stream of4 mixtureassumeswith relation to the brush.

It will be noted that the collar 5r andthe lannulus56 are readilyremovable from the head so as to facilitate cleaning of the airpassages. By loosening the. screw 43 aud raising the rod 38 out ofengagement with the paint nozzle the entire paint discharge unit maybewithdrawnfrom the 4lug 42, whereupon the head .22 may be unscrewedfrom the body'l. All parts of the air and paint discharge means aretherefore'readily accessible for cleaning purposes.

It will be apparent-that many modificavention. The foregoing descriptionhas beenmade detailed merely for the sake ot' lucidity and is not4intended as a limitation of the invention to the embodiment hereindisclosed.

I claim as my invention:

1. A pneumatic paint brush having, in combination, an air discharge headprovided with a small centralY air passagev which is outwardly flared atits forward end, the' head further having la hole through one sidecommunicating with' said. flaring portion, a paint discharge structurelocated outside of said head and pr )jecting through said hole andhaving its tip within said flaring' portion,said head having twocircumferential air outlets arranged to direct lateral streams of air ina direction oblique to and converging toward the central stream, andsaid head having means communicating with said central passage forsupplying air to said circumferential outlets.

2. A pneumatic` paint brush Vhaving a head which is provided wlth acentral air' "tions and alternative arrangements not hereloutlet passageand converging circumfermeans extending at an angle to the central air'passage and having its tip located in f/ront of said central pasage andbetweenl said circumferential outlet-s.

3. A pneumatic paint brush having a two art head, the parts of which areprovided with contacting outer and inner tapered said annulus to holdsaid tapered peripheries on the annulus and head in close contact, thesaid peripheries having complementary y grooves forming a continuousannular air passage, the head having a supply passage leading to saidannular passage, and the annulus having closed grooves leading forwardlyfrom said annular passage and providing converging outlets for the air,and means for controlling the flow of air t0 said annular passage.

5. A pneumatic paint brush having, in combination, a head provided witha central air outlet passage and flared at its forward end, paintdischarge means having its tip projecting into the iaring portion ofsaid passage, an annulus surrounding said head, said annulus and headbeing 'provided with forwardly tapering internal and eX- ternalperipheries respectively, a collar threaded on said head and engaging'said annulus to hold said tapered peripheries in air-tight contact,said annulus and head having complementary grooves forming an annularair passage, the head having a supply passage leading from said centralair outlet to said annular passage and said annulus having two opposedinternal grooves leading forwardly from said annular passage andproviding converging air outlets arranged to direct streams of airagainst opposite sides. of the central stream.

6. A pneumatic paint brush having, in combination, a tubular nozzletapered at its forward end, a paint tube fitting slidably within saidnozzle, a tapered valve member within said nozzle arranged to close theforward end thereof, and two spacedbars connecting said valve memberwith the forward end of said paint tube, said bars being of small crosssection whereby they occupy but a small portion of the cross-sectionalarea of the nozzle.

7. A pneumatic paint brush having, in con'ibination, a tubular body, ahandle depending from said body, the body having a large slot throughwhich a trigger lever may depend in front of said handle andthe bodyhaving a narrower communicating slot extending. rearwardly from thefirst slot, a bolt having a head which is insertable into the bodythrough the first mentioned slot, said bolt then being slidable into thenarrower slot through the open end of the latter, the head of the boltoverlylng the sides of said narrower slot, and the bolt passing.

through a portion at the upper end of. said handle, and a nut threadedon the lower end of said bolt and arranged to clamp the handle to thebody.

8. A pneumatic paint brush having, in combination, an air discharge headprovided with a small central air passage which is outwardly flared atits forward end, a paint discharge structure operatively associated withsaid head, means. for supplying air to said head, the air through saidcentral passage acting to induce a flow of paint from saidpaint-discharge structure, said head having two. circumferential airoutlets arranged to direct lateral streams of air in a direction obliqueto and converging toward the central stream, and said head having apassage communicating with said central passage for supplying air tosaid outlets.

9. A pneumatic paint brush having, in combination, a tubular body havingan opening, a handle projecting from said body at said opening andhaving a fastening member projecting therefrom through said opening intosaid body to hold said handle inassembled relation thereto, said bodybeing provided with an enlarged opening, and trigger meansoperatingtherein to control the operation of said brush, said enlargedopening being adapted to permit the insertion of said fastening membertherethrough into saidA opening provided therefor.

10. A pneumatic. paint brush having, in combinatlon, a tubular body, ahandle therefor having a trigger for controlling the operation of saidbrush, said body having an enlarged opening to admit and permit theoperation therein of said trigger and a slot extending from saidopening, and a fastening for said handle having a head thereon to holdsaid handle to said body, said .opening being adapted to receive saidhead to plermit the entry of said fastening into said s ot.

11. A pneumatic paint brush having, in combination, a head provided witha main air outlet outwardly flared at its forward end, means forsupplying paint to said out let, the flow of air through said outletservuing to induce a flow of paint. a rotary member secured to said headand having a pair of diametrically opposite side air outlets inclined todirect two supplemental streams of air against opposite sides of saidstream of paint 1n a manner to cause a wiping action, and means forsupplying air to said outlets. 12. A pneumatic paint brush having, incombination, a head provided with a central air passage outwardly flaredat its forward end, a paint supply means associated with said airpassage, the flow -of air through lll) with said central passage, meansAfor supplying air to said airpassage, and means controlling th outlets.

In testimon -my hand.

for e flow of air through saidv side 10 y y whereof, I have hereunto setY 'JENs A. PASCH.

